By making a cash donation to The Salvation Army, you are able to claim a charitable deduction of up to 50% of your adjusted gross income in the year you make the gift. If you cannot utilize the entire deduction in that year, deductions may be carried over for an additional five years.
Scientists learn about the layers deep within the Earth's crust by studying how seismic waves travel through the Earth.If there is an earthquake somewhere, seismagraphs in many locations will record it.
The Earthâs structure can be defined in several ways, but general, we see the Earth as having a solid crust on the outside, an inner and an outer core, and the mantle in between. The crustâs thickness varies between some 10 km and just over 70 km, having an average of about 40 km.